Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrvl..50..412f&link_type=abstract
Physical Review Letters, vol. 50, Feb. 7, 1983, p. 412-416.
Physics
87
Alpha Decay, Beryllium, Solar Neutrinos, Beryllium 7, Capture Effect, Chlorine, Cross Sections, Radiative Capture, 6<=A<=19
Scientific paper
New measurements are reported of the Be-7(p, gamma)B-8 cross section and the resulting S factors down to E(c.m.) = 117 keV, with numerous consistency checks made to reduce possible systematic errors. The cross section is measured by detecting the delayed alpha particles from the sequence Be-7(p, gamma)B-8 - Be-8(metastable) - 2alpha. In the experiment, the target is mounted on a rotating arm transferred in vacuum from a bombardment chamber to a counting chamber where the alpha particles from the B-8 decay (half-life, 0.77 sec) are detected. A silicon surface-barrier detector with an active area of 300 sq mm and a depletion depth of 23 microns is installed to detect the alpha particles. Two independent methods are employed in determining the areal density of the Be-7 target. The inferred zero-energy S factor from the present experiment is 0.0216 + or - 0.0025 keV b, a value that reduces the predicted Cl-37 solar-neutrino capture rate by about 25%.
Davids Cary N.
Elwyn A. J.
Filippone B. W.
Koetke D. D.
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